worrying after an early scan 😔

Sarah
I had an early scan as it took me 3 years to concieve and my last ended in a miscarriage before that. 
On my scan my baby had a really strong heartbeat from what i could see and was perfectly fine until she checked everything else out and said i had a blood clot in my uterus messuring 1.54cm and my baby was 0.44cm
I am really scared and worried never none anything like this before has anybody else experienced this?